Setting Labels to Variables, Objects and Watches
You can add your own label to a variable, object, or watch and then reference it as if it were a local variable
<label-name>_DebugLabel defined in the same context where the expression is evaluated. RubyMine also displays these labels in suggestion lists for code completion in the Evaluate Expression dialog.
Assign a label
Select a watch in the list
Press F11 or select Mark Object from the context menu. The Select object label dialog opens.
Specify the label name. Use alphanumeric characters without spaces. Optionally, click Browse next to the preview to change the label color.
Click OK to assign the label.
Remove a label
Select the item in the list and press F11.
Right-click the item and select Unmark Object from the context menu